Problem 2C
Test 1
 3
 AC
 2
Solution
 4
 BC

Test 2
 4
 AC
 3
Solution
 6
 B

Test 3
 8
 BEF
 0
Solution
 179
 BEF

Test 4
 10
 ABCDEFGHIJ
 20
Solution
 10
 ABCDEH

Test 5
 16
 BDFHJLNP
 200
Solution
 43698
 BDFIMO

Test 6
 20
 BDFHJLNPRT
 2000
Solution
 699060
 BDFIJLMS

Test 7
 26
 EFGHIJKLNOPQRSTUVWXYZ
 20000
Solution
 62922773
 EFGHIJKNRSTVX